Geoege havell



(NoModel.)

G. HAVELL.

MANUFAGTURE OF KNIFE BLADES AND BOLSTERS.

No. 373,527. Patented Nov. 22, 1887.

22%. 22,4. 22% jaja.

UNITED STATES ATENT Erica.

GEORGE HAVELL, OF NEWARK, NEVV JERSEY.

MANUFACTURE OF KNIFE BLADES AND BOLSTERS.

EBPBCIFIC'ATION forming part of Letters Patent No. 373,527, dated November 22, 1887.

Application filed August 1, 1887.

To all whomI may concern:

'Be it known that I, GEORGE HAVELL, a citizen of the United States, residing at Newark, Essex county, New Jersey, have invented certain new and useful Iniprovements in Knife Blades and Bolsters, fully described and represented in the following specification and the aceompanying drawings,forming a part of the anie.

The object of this invention is to provide a sheet-metal k nife-blade with a strong tang,and with a solid bolster fitted tightly upon the tang and shanl: of the blade.

To form a strong tang by which a sheet-metal blade may be rigidly secured in the handle, I cut the tang in one piece with the blade, but Wide enough to swage upon the edges, so as to form it into a rounded bar of greater thiekness than the blade. A bolster formed to slip over such tang would not then fit closely against the shank or butt of the blade, and to secure such close contact at the central point, where the hole through the bolster is enlarged to pass over the tang, I compress the entire bolster upon the tang and butt of the blade, and thus secure the close fit desired.

To fit the button-shank of the blade to the bolster, I form the butt adjacent to the tang With a convex Outline, and form a concave recess in the upper end of the bolster, adapted to fit the thickness of the blade at that point.

The invention will be understood by reference to the annexed drawings, in which Fignre 1 is a side view of the finished knife blade and bolster, with the latter in section. Fig. 2 is an edge view of the same with the bolster in section. Fig. 8 is an edge view of the blade With the bolster in section, shown ready for compression upon the tang' and bed of the blade. Fig. 4 is a side view of the knife and bolster as completed. Fig. 5 is a longitudinal section of the bolster shown in Fig. 2. Fig. 6 is a similar section of the bolster shown in Fig. 1. Fig. 7 is a plan of the bolster shown in Figs. 2 and 5, and Fig. 8 is a plan of the bolster shown in Figs. 3 and'. Fig. 9 is a side view of the blank for the tang attached to the butt of the blade. Fig. 10 is a diagram showing the dies Operating upon the edges of the blank to form a round tang, and Fig. 11 a section of the dies to compress the bolster.

Serial No. 215,783. (No model.)

a is the knife-blade; a', the blank for the tang; b, the finished tang; c, the convexities at the butt of the blade; d, the notch in the top of the bolster formed to receive the same, and e the hole formed longitudinally through the center of the bolster and intersecting such groove to permit the introdnction of the tang.

In the manufacture of my improved knife I cut from suitable sheet metal a blank adapted to form the blade and tang, the part intended for the latter being made wider than the proposed tang, as shown at a' in Fig. 9, and then compressed upon its edges, as in the dies g, (shown in Fig.10.) so as to make it narrower and thicker and impart to it a prismatic form, as round or square.

Heretofore the sheet-metal blades for case' knivcs have been secured in handles by forming a tang-plate as wide as the handle and riveting the latter in two parts upon the opposite side of such plate. By my invention I form a strong rigid tang of the sheet metal, but of such form as to be inserted wholly within the handle, like the tangs of forged blades, and thus produce a more valuableand attractive article for sale. When the tang is inserted through the bolster with the butt of the blade resting in the handle d, the hole eis exposed at the upper end of the bolster above the corners b' of the tang, forming cavities e' at each side of the blade, which would not only mar the appearance of the bolster, but permit the access of water to the intcrior of the handle to which the tang was fitted. To close such cavities I apply suitable dies, g', to the bolster, as shown in Fig. 11, and compress it closely against the knife-blade over the upper shoulder of the tang, as, shown in Ifig. 2, and thus form a close permanent joint between the bolster and butt of the blade, as illustrated in Fig. 4.

The appearance of the bolster before compression is shown in Figs. 6 and 8, and after the compression in Figs. 5 and 7, the sides of the hole e being forced inward to close contact with the blade, so as to clamp the latterfirmly and remain permanently iu contact therewith. That part of the bolster which is pressed inward is locked upon the upper corners of the tang produced by the expa-nsion of its thickness, and the bolster is thus permanently secured upon the blade, while it is fitted closely 2' i o 'usz'i to the latter, as if formed in one piece therewith.

The notch or recess d is shown in Figs.1, 5,

i and 6 of concave form, adapted to receivethe ilo butt of the blade and brace it sidewise, while the front and rear edges of the bolster (shown at Z Z' in Figs. 6 and 8) are free from any indentation through which the knife-blade itself would be exposed when finished. The bolster thus presents much mo're strikingly the appearance of being integral with the blade than if the front and rear edges of the bolster exhibited notehes into which the blade was inserted. p

Myinvention is especially adapted to the manufacture of knife-blades from aspecies of White metal which takes a high temper by mere hammering, and by forming the bolsters by casting of the same metal and drilling the hole e and milling out the notch d, I form a clean metallic contact between the bolster and blad-e, and form an article which appears as if made integral throughout. The thickening of the tang by compression upon its edges also gives it a rigidity and magnitude adapted to cement it in a bone or composition handle, like a solid forged tang.

The notch d and hole e may be for med by.

casting or any other suitable means; but the re-enforcing of the tang to stiffen and thicken it can only be produced by compression upon Having thus set forth my invention, what I` elaim herein is- 1. The improved method herein described form thicker than the knife-blade, substantially as set forth.

3. The method herein shown and described for applying abolstei` tightly to a knife-blade to narrow it and shape it into a' cylindrical having a tang'thicker than the blade, which consists in, first, forming the bolster.with a notch to lit the butt of the blade and a central aperture to admit the tang;iin, seeondly, slipping the tang over the bolster against the butt of the blade, and in, thirdly, compressingt the sides of t the bolster to close the central aperture against the bntt of the blade, as and for the purpose set forth. I.

4. A knife-bladeformed of sheet metal with tang thickened by compression upon its edges, substantially as vset forth.

5-. A knife-bolster having a notch formed in its top to fit the butt ofaknife-blade and a hole of greater diameter than the breadth'of the 'notch formed through the bolster to admit the tang, as and for the purpose setforth.

In testimony whereof I have hereunto set my hand in the presencc of two subscribing witnesses. w

. GEORGE I-IAVELL.

`VVitnesses:

A. G. WILLIAMs, THos. S. GRANE.

It is hereby certified that in Letters Patent No. 373,527, granted November 22, I

upon the application of George Havell, of Newark, New Jersey, for an improve .in the Manufaoture of Knife Blades and Bo1sters, errors appear in the printed E fication requiring eorreetiou as follows: On page 1, line 27, the eompound word bu shank, should read butt or shemh, and on page 2, line 65, the elause slipping and tha Letters Patent should be read With these eorreetious therein that the same may e01 tang over the bolster should read slppi'ng the bolstr over the tang;

to the record of the case in the 13atent Office.

Signed, countersigned, and sealed this 29th day of November, A..D. 1887.

D. L. HAVVKINS, Act-mg Secretcu'y of the In' [SEAL] Countersigned BENTON J. HALL,

OOmm-issione' of Patents. 

